Resurgence in the radio flux of the magnetar XTE J1810-197

ATel #13840; M. E. Lower (Swinburne University of Technology "SUT"), V. Gupta (SUT), C. Flynn (SUT), M. Bailes (SUT), A. Jameson (SUT), W. Farah (SETI Institute), T. Bateman (SUT), D. Campbell-Wilson (The University of Sydney "USyd"), C. K. Day (SUT), A. Deller (SUT), A. J. Green (USyd), A. Mandlik (SUT), S. Oslowski (SUT), A. Parthasarathy (Max-Planck-Institut fuer Radioastronomie "MPIfR"), D. C. Price (SUT), A. Sutherland (SUT), D. Temby (USyd), G. Torr (SUT), G. Urquhart (SUT), V. Venkatraman Krishnan (MPIfR), T. Venville (SUT)
on 30 Jun 2020; 07:32 UT
Credential Certification: Marcus Lower (mlower@swin.edu.au)

Tweet

Following its radio revival in late-2018 (Levin et al. 2019) we have performed regular timing observations of the magnetar XTE J1810-197 with the Molonglo Observatory Synthesis Telescope as part of the UTMOST project (Bailes et al. 2017).

During a recent observation at UTC 2020-06-22-14:02:29, we measured a period averaged flux density of 35 +/- 7 mJy at 835 MHz via the radiometer equation. This is a factor of ~2.7 greater than the flux density of 13 +/- 5 mJy measured 5 days earlier at UTC 2020-06-17-14:22:07, and a factor of ~5 times higher than observations in February 2020. The radio intensity appears to have decayed to flux densities between 15-20 mJy in the days following the resurgence. All observations make use of the high dispersion measure pulsar PSR J1644-4559 as a flux density reference.

Bright single pulses with peak flux densities up to 50 +/- 15 Jy were detected throughout most post-resurgence observations. An example of the dynamic spectrum and integrated profile of one such pulse is presented in the link below.

References:
Bailes, M, et al., 2017, PASA, 34 e045.
Levin, L, et al., 2019, MNRAS, 488, 5251.

XTE J1810-197 flux density and single pulses